Attachment for projectors



Sept. 21;'1926.

INVENroR.

ATTORNEY.

Patented Sept.l21, 1926.

umore, oF ,seu Fueuoleoo, oALLFouNIA. eeereuoe oe olie-,uitte To "torte el eeueuirutu weer' reeuo'feoo, 'foetiiiioumeTTAoHMEN'r .ron rnoancrons.

Appiigation med nach 2e, 19425. serial no. 15,400.

rl`his invention relates to improvements in stereoptieoll proiettore, and. more Pettoulef- 1y to jan attachment such as is illustrated Iin my epploat'on, `Serial Number .6.7158887. .led October 31, 1923.

Insaid application VI have shown and de- Sorbed an ,attachment for Proiettore Whereby .flexible film muy loe moreel at will .Peet a window iu the ,proieotor so as to ojeuee reediug metter. and ythe like, Printed Aou the -luu toY be proieotetl upon e' .Soreeu and to -tlteyel from bottom totop thereof with uooutiuuoue motion, but sufficiently Lslow `to permit reading of the texta'ppxearing on thergfilm. In said ,uttuehmeut have Provided au ediuetable means rvherebythe `size of ythe Window oraper'ture may be conveniently varied, particularly as to height, so `as to disclose a single line or any desired number of lines of reading matter atone time. Also in such prior vapparatus variation in the Widthnot the window or aperture could be brought about by inserting an opaque plate in `fthe usual slide carrier,'which remains in place back of the film attachment.`

@In yand by he present Yinvention I have provided an improved means for controlling the Windowoor aperture in a ,horizontal direc-` tion insuch a Way that each vletter lof a 'Word maybe `separately projected in succession. This permits 'the operator l to spell' out a lWord, one letter at a time, in order .to 'attract attention .and emphasize' some particular part of vthe announcement. The device ,may be operated so as to Wipe out yeach letter after'it has been projected ysuiliciently long,

or optionally -to ,allow the projected' letters to remain exposed While other letters in yturn are being uncovered.' This mechanism' I have termed a spelling attachment. It .is s ,o mounted as to -be swung out ,of the Way quickly in order that the full Width of the Window or aperture may be uncovered for ordinary projection.

`1One form which my invention may assume is exemplified in the following description and illustrated inthe accompanying .drowizng,invvhich o y 1 shovvs a front elevation of 4an at teehulent embodying my invention; F1a 2 .Shows u' etle ,elevation off the ,Seme 111 Place upon 4e .etereontieou proieetor;

Fig. 3 shows la sectional view taken kon line S-.ofFig-l; I

Fig. 4 `shows an enlarged detail -viertT in edeelevution of the ,epeouemeoheuieul used in connection with .the spellingattachment; Fig .5 elloyvee eeetiouelvieyvfteken 4ouille line 5-5 ofFig. ,4. j d Y Referring ,in .elete-ileto the uoeolupeuyus drawing, I'Show euattaohuieut mounted ,ou a elieleoerrer 10 in .front .of the .Condenser houeiue of e .Stereortoou Proieotor Anot ehown- The ettuohmeut includes vu .treme 1,1 hiugedret ite upper end te e-breeket 12, whiolflutter ie :xed to the Slide .Carrier- Therebyf-the entire ,attachment muy loe ,erung upwardly, out of the wey ofthe-Slide .ear-` rel, and 'held iu raised position; :by Ineens of arms .13, ,so :that,the stereopticon.projector maybe .employed iu the'orduury rey; ueue rletee Yor v.eldee- Said frame 11 y,is

The frame at its-upper portion carries a supply reel 18 for afleXible hlm 19, andnear the lower end of said frame isa storagereel 20 for said film. The iilm lthus passes down Wardly across the aperture' or Window in the frame, and preferably gnidedandbeld in rovided with a Windoyi7 Y o1 leperture 14 lto allem with the Wudoyvgor aperture ,111 .the Slide-earner, and this aper-y position by a hinged guide 2l on the front of said frame.

Means are provided for driving the storage reel, and such means in the present case includes a worm gear 22 fixed on the shaft of said storage reels, a screw 23 meshing with said worm gear, a bevel gear 24 on the end of said screw, which bevel gear meshes with a bevel pinion 25 on a crank shaft 2G. This worm drive gives a reduction of about to l, which is approximately what is required in-order to impart motion to the film sufliciently slow toY permit the text of the projected mattei' to be read while the crank is being turned at a convenient speed. The upper or supply reel 18 provided with a suitable crank or disk 27 Vfor rewinding the film, and in order that the lower reel may be released at this time from the locking effect of a worm drive, I arrange the bearings of the screw shaft 23 upon a plate 23, which is supported pivotally at Vone. end on the crank shaft 26. The other end of this plate is looselyV held by a screw 29.k Thus the screw shaft may be swung-out of mesh with the worm gear 2.2 when the film is being rewound, and at other times said screw shaft will be meshed with the worm gear and securely held by the screw 29.l

It is olovious from the foregoing that the size of the window or aperture maybe varie-d as to height by a movement of the shutters l5 in opposite directions, suoli adjustment being from full open position to closed position. I find it desirable in projecting lannouncements and Iother reading matter to emphasize or call attention to some particular line or word. For this purpose the shutters can bemoved so as to relduce the vertical dimensions of the window or aperture to a size just sufficient to permit one line ofre-ading matter to be projected. In order to emphasize or call attention to some particular word or words, it is desirable to provide for horizontal control of the aperture or window, and this I accomplish by the so-called spelling attachment7 of the present invention.

In its preferred form, this spelling attachment consists of a frame 30 which in length is approximately twice the width of the window or aperture across which the film travels, and which is arranged to be positioned across said aperture near t-he middle thereof. This frame 3() has a pluralitv of legs 3l near one end, each leg being forum'ed with a bearing 32 slidably YYmounted on a rod 33. This rod is supported' in bearings 34 fixed to the hinged gate 2l, so as to swing therewith. One of these bearings, to-wit, the one at the left in Fig. l, is supported 'in exten-ded position by an arm 35, so as to allow'ample movement of the bearings 32 along the rod. One of the bearings 32, as shown 1n Fig. 5, carries a spring-pressed ball 36 to co-operate with notches 37 formed on the rod 33. Preferably there is a screw 36a for adjusting the tension of the spring. The distance between the notches 3'? corresponds with the spacing of the letters on the film, so that when the frame 30is shifted from one notch to the other, it will have travelled the distance between two letters on the film.

The frame 30 is formed with guides 38 to slidablyreceive a. bar 39. l This bar is apfproximately the same lenoth as the frame 3U, and is formed with asmfllopening l0 intermediate its ends. This opening is of a size to Ipermitjthe rays projected by a single letter to pass through. Preferably there is astud or buttonl-l on the bar, so that it can be conveniently adjusted within the guideways. Y

In the use of this spelling attachment, the

frame 3() ordinarily at the outsetv will be shifted t'o the right of the position, shown iii Fig. l, so that the opening fl() will line up with the first letter of the word to be spelled.. Thereafter the entire frame 3() can vbe advanced intermittently to the left a distance corresponding with the spaces between the adjacent letters, so that the opening e() will traverse the entire width of the window 'or aperture across which the film travels. A.

lmndlell2is` preferably provided for the frame, and the operator by grasping this handle can conveniently move the frame one Y at a time, owing to the action ofthe spring-pressed ball 36v co-operati'ng with the notches in the rod 33.

That part of the frame 30 overhanging the legs 3l is open between the guides 33, so that the projected rays may pass through the opening l0 in any position of adjustment of said opening.

' From the foregoing', it will be' seen that when the opening l0 in the bar 39 is used, only one letter at a time will be projected, and each letter will be wiped out before the next letter comes into view. This is avery effective and attractive feature for some purposes, but at other times it is desirable to allow all letters to remain on the screen after they have been projected. To accomplish this the bar 39 is moved to a position where the open portion of the frame 30 is uncovered, that is to say, the'bar willbe moved to the left of the position shown in Fig. l.

`The shiftable frame is then moved to its lOO "attachment,ftheI-frame 30 can'rbe swung.: downwardly to a 'horizontal-'position about .f *the rodf'33, thus-clearing the spaceV in front "ofi thel windowflor aperture. i

bar 39 'permits-of. positioning thelope'ninglfiO at any desiredv point in front of the aperture Ior window, soas to adjust it to the position ofthe letters 'on the film. AAn adjustment is also provided for the rod 33 so that the notches therein may be set in accordance with the position of the letters on the film. This latter adjustment consists of slidably mounting the rod 33 in its bearings 34 and providing a set screw 43 for one ofl these bearings, .so as to hold the rod in adjusted position. Y

While the present invention is particularly applicable to a film attachment of the character shown in my prior application above mentioned, it is obvious that it may be applied to the usual projector for co-operation with slides or plates.

Various changes in the construction and arrangement Vof the several parts herein shown and described may be employed, without departing from the spirit of my invention, as disclosed in the appended claims.

lVhat I claim as new and desire to secure by Let-ters Patent is: i

l. The combination with a projecting apparatus having a projecting aperture and an image-support 'disposed across the same, said image-support containing reading matter on horizontal lines, adjustable means for varying the size of said aperture in a vertical direction, so as to permit the projection of a single line of reading matter, a horizontally movable mask for controlling said aperture in a horizontal direction, and means for retarding the horizontal movement of said mask at spaced intervalsso as to uncover at each movement a space corresponding to one letter of the reading matter.

2. The combination with a projecting apparatus havingr a projecting aperture and an image-support disposed across the same, said image-support containing reading matter on horizontal lines, adjustable means for varying the size of the aperture in a vertical direction so as to permit the projection of a single line of reading matter, a mask movable horizontally across said aperture, having a small window to admit light raysl from a portion of the image-support corresponding in size to one letter, adjustable means wherebyk said window portion of the mask may be covered, and means for retarding the horizontal movement of the mask at spaced intervals corresponding to one letter at each movement.

3. 1n combination with a projecting apparatus having a projecting aperture and an image-support disposed across the same, means for controlling the projecting aperture in a horizontal irection, comprising a mask: movablet across `gsaidfl aperture z inf a. horizontal'ldirectionrand yprovided with a fsmall windowfto'admit'lightrays from are- The I slidable stricted= .portion zof s they im'auge-support,-y and ffrliction'imeans forrreta'rding ythe movements j thereof at regularly; spacedy -intervals.

a 4.. The :combination with a :proj ecting apaparatusfof meansvfor controlling the projecting aperture in a horizontal direction, comprising a mask disposed across the said aperture, a horizontal track member on which the mask is mounted for sliding movement, and a friction stop between the mask and horizontal track member serving to check the movements of the mask at'regularly spaced intervals. Y

5. The combination with a projecting apparatus of means for controlling the projecting aperture in a horizontal direction, comprising a mask disposed across said aperture, a 'horizontal track member on which the mask is mounted for sliding movement, a friction stop between the mask and horizontal Atrack member serving to check the movements of the mask at regularly spaced intervals, and anadjustable mem- -ber on l*the mask having a small window adapted to be disposed in front of the aperture of the projecting apparatus.

6. The combination with aprojecting apparatus of means for controlling the projecting aperture in a horizontall direction, comprising a mask disposed across the said aperture, a horizontal track member on which the mask is mounted for sliding movement, and a friction stop between the mask and horizontal track member serving to check the movements of Athe mask at regularly spaced intervals, said mask being mounted on the track member so as to swing in a vertical plane to uncoverv the aperture of the projecting apparatus.

7. The combination vwith a projecting apparatus of means for controlling the projectingaperture in a horizontal direction, comprising a mask disposed across the said aperture, a horizontal track member on which the mask is mounted for sliding movement, a friction stop between the mask and horizontal track member serving to check the movements of the mask at regularly spaced intervals, and a hinged member on which said mask and track are mounted.

V8. The combination with a projecting api paratus of means for controlling the projecting aperture in a horizontal direction, comprising a mask disposed across the said aperture, a horizontal track member on which the mask is mounted for sliding movement, a frictionl stop between the mask and horizontal track member serving to check the movements of the mask at regularly spaced intervals', and means for adjusting said track member longitudinally. l 9. In, combination with a projecting api paratus having a projecting aperture and an image-support disposed across the same, adjustable means for Varying the size of the aperture in a vertical direction, and means 8 for controlling said aperture horizontally and comprising a horizontal track member formed with depressions at regularly spaced intervals7 a mask slidably mounted on said track member, a spring-pressed catch carried by the mask and co-operatng With the 10 depressions on said track member, yand a slidable bar carried by said mask and proided intermediate its ends With a small Win- WILLIAM J. CITRON 

